Photoelectrocatalytic oxygen production from water splitting using WO3 photoanode fabricated by dip coating technique

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Chatchai Ponchio Farut Supanantin Nattapong Petsaen Anurut Poowancum

Abstract

This research has developed tungsten oxide (WO3) anode electrode fabrication to enhance photoelectrocatalytic water oxidation property. The WO3 thin film was fabricated on a conducting glass fluorine doped tin oxide (FTO) substrate by a simple dip coating method. The photoelectrocatalytic property was studied by measuring the photocurrent from water oxidation reaction at an applied potential of 1 V in NaCl electrolyte solution under visible light irradiation. Moreover, the catalytic mechanisms at the electrode surface were studied with the mechanism of photocatalytic (PC), electrocatalytic (EC), and photoelectrocatalytic (PEC) by comparing the dissolved oxygen (DO) value in water. The result found that the dipping times are the main effect with the photoelectrocatalytic property of the fabricated WO3 by dip coating technique and found that at 15 min is the optimized condition. It was found that the PEC mechanism presents a higher efficiency for oxygen production than EC and PC mechanism, respectively. The research shows that this introduced dip coating method can fabricate the WO3 thin film for high-efficiency oxygen evolution with the simple method and suitable for further scaling up application.

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